It's the car that's at fault, not the remap. For a while there were fingers pointing at Revo as the majority of mapped cars seemed to be Revo, but of late there have been a couple of new MTM cars floating about with the same issue.
I'm going to do some investigative analysis / a case study and put Revo Stg 1 on the car next week (1,600 miles on the car now), and see how long it takes to suffer an issue. When / if the issue appears I'll take car to Revo so they can fathom WTF is actually going on. There is a lot of misplaced conjecture forming as to the reasons and personally I'd rather be working on facts rather than maybe's.
I don't dispute at all that plugs aren't lasting long enough, and misfires are all too common, but what seems odd is that beyond stage 1 these issues tend to evaporate, and given most people running stage 1 are running std intakes / exhausts / fuel pumps I'm wondering whether the limitations of these are causing the issues rather than the maps.
There are too many satisfied customers out there for all brands (including TT-S / Golf R / Scirocco R owners), so if these issues were an epidemic I'm sure it would all be all over the web.
Hopefully once we get people who can data log involved in the process (e.g. not Audi and their generally sub standard service techs), the facts will start to bubble to the surface. I intend to be sharing findings with NGK too and they will be getting pictures of plugs to see if they have any opinions.